Adding DRP specfic UMA for FirstContentfulPaint

content/test/test_render_frame_host.h

Index: content/test/test_render_frame_host.h
diff --git a/content/test/test_render_frame_host.h b/content/test/test_render_frame_host.h
index 34752ce138279a04c376dbe0322b880301d32f36..3460a0985f4c206a7611530d9c7f4e2e32ad049e 100644
--- a/content/test/test_render_frame_host.h
+++ b/content/test/test_render_frame_host.h
@@ -107,20 +107,26 @@ class TestRenderFrameHost : public RenderFrameHostImpl,
   void DidEnforceStrictMixedContentChecking();
 
   // If set, navigations will appear to have cleared the history list in the
   // RenderFrame
   // (FrameHostMsg_DidCommitProvisionalLoad_Params::history_list_was_cleared).
   // False by default.
   void set_simulate_history_list_was_cleared(bool cleared) {
     simulate_history_list_was_cleared_ = cleared;
   }
 
+  // If set, navigations will appear to have been proxied through the
+  // data reduction proxy.
+  void set_simulate_used_data_reduction_proxy(bool enabled) {
+    simulate_fetch_via_data_reduction_proxy_ = enabled;
+  }
+
   // Advances the RenderFrameHost (and through it the RenderFrameHostManager) to
   // a state where a new navigation can be committed by a renderer. Currently,
   // this simulates a BeforeUnload ACK from the renderer.
   // PlzNavigate: this simulates a BeforeUnload ACK from the renderer, and the
   // interaction with the IO thread up until the response is ready to commit.
   void PrepareForCommit();
 
   // This method does the same as PrepareForCommit.
   // PlzNavigate: Beyond doing the same as PrepareForCommit, this method will
   // also simulate a server redirect to |redirect_url|. If the URL is empty the
@@ -142,17 +148,17 @@ class TestRenderFrameHost : public RenderFrameHostImpl,
 
   // Computes the page ID for a pending navigation in this RenderFrameHost;
   int32_t ComputeNextPageID();
 
   TestRenderFrameHostCreationObserver child_creation_observer_;
 
   std::string contents_mime_type_;
 
   // See set_simulate_history_list_was_cleared() above.
   bool simulate_history_list_was_cleared_;
-
+  bool simulate_fetch_via_data_reduction_proxy_;
   DISALLOW_COPY_AND_ASSIGN(TestRenderFrameHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_RENDER_FRAME_HOST_H_